CN113464608A

CN113464608A - Belt pulley decoupler with through hole

Info

Publication number: CN113464608A
Application number: CN202110293906.7A
Authority: CN
Inventors: 安德里亚斯·斯达夫; 梅勒妮·斯利曼恩
Original assignee: Schaeffler Technologies AG and Co KG
Current assignee: Schaeffler Technologies AG and Co KG
Priority date: 2020-03-30
Filing date: 2021-03-19
Publication date: 2021-10-01
Also published as: DE102020108693A1

Abstract

The pulley decoupler (2) has a through-hole (17) which is formed by overlapping openings (16) in the plurality of components (12), wherein a closure component (18) is accommodated in a manner that prevents separation, said closure component having closed lateral surfaces (19) for preventing particles from penetrating between the components (12) in the region of the openings (16). At the same time, the closure element (18) forms a ventilation channel (20) through which an air flow (25) can pass, for example, in order to cool the torsional vibration damper (3). This design is advantageous in particular when, for example, the installation space of a motor vehicle is insufficient and the torsional vibration damper (3) cannot circulate freely, i.e. when this torsional vibration damper is constructed, for example, close to the engine, so that the torsional vibration damper (3) is located between the engine, for example, an internal combustion engine, and the pulley decoupler (2).

Description

Belt pulley decoupler with through hole

Technical Field

The invention relates to a pulley decoupler having a through bore through which fluid can flow. The pulley decoupler is particularly useful for a belt drive in a motor vehicle.

Background

WO 2015/010190 a1, for example, discloses a pulley decoupler for use in an automobile. The installation space of modern motor vehicles is becoming increasingly scarce due to the large number of devices required, so that it is often necessary to improve the cooling of the devices.

Disclosure of Invention

In view of the above, the technical problem underlying the present invention is to overcome at least partially the problems known in the prior art.

The solution of the invention to achieve the object described above is characterized by the features of the independent claim 1. Further advantageous embodiments of the invention are indicated in the dependent claims. The features listed individually in the dependent claims can be combined with one another in a technically meaningful manner and can define further embodiments of the invention. Furthermore, the features given in the claims will be explained and explained in more detail in the description, in which further preferred embodiments of the invention are shown.

The proposed pulley decoupler comprises a plurality of components comprising at least one hub for connection with a body rotatable about a rotational axis, an input part and an output part, wherein the hub is connected in a torque-transmitting manner with the input part or the output part, wherein at least two components have at least one opening which overlaps one another to form a through-hole through the pulley decoupler, wherein a closure member is inserted in a manner such that it is secured against disengagement into the through-hole, the closure member being bounded radially on the outside by a closed side face which defines on the inside a through-going ventilation channel through which the pulley decoupler is flowable for a fluid.

The pulley decoupler is preferably used in an automobile. A pulley decoupler allows a reduction in rotational imbalance when transmitting forces from an input member connected to a shaft body (e.g., a drive shaft of an internal combustion engine) via a hub to an output member transmitting forces via a traction element, in particular a belt. For this purpose, a spring arrangement is formed between the input part and the output part, which spring arrangement generates a restoring force when the output part is deflected by torsional vibrations relative to the input part. A connection that transmits torque means that rotation of the hub will cause rotation of the corresponding member (e.g., the input member). In particular, a torsionally stiff connection is present.

The term "detachment-proof" refers to the inability to remove the closure member from the through-hole without damage. The through-hole may have any shape, in particular a cylindrical shape, a cubical shape or a cylindrical shape with an oval cross-section. The shape of the closure member is adapted accordingly. The openings in the respective members partially or completely overlap and form a through-hole which passes through the pulley separator in the direction of the axis of rotation. The closure member has closed sides and is open on the end face, so that the ventilation channel is closed radially on the outside and is open axially on the end face. Preferably, a plurality of through-holes is formed. A respective closing element is preferably formed in each through-opening. The closing element is made in particular of metal, preferably steel and/or plastic. The hub has in particular a toothing corresponding to the external toothing of the shaft body.

The output part preferably has no corresponding opening. The components preferably also comprise the diaphragm spring, the intermediate disk and/or the individual or all intermediate disk components for forming the intermediate disk.

The closure member allows the formation of a ventilation channel through the pulley decoupler and at the same time prevents the penetration of particles or dirt between these members by the closed sides, the openings of these members forming the through-holes. Air may flow as a fluid through the ventilation channel so as to be able to act as a cooling medium for cooling without particles entrained in the air accumulating on or between the components through which the through-holes extend.

The closure element is preferably at least partially designed as a hollow cylinder. This hollow cylinder may have a circular or elliptical cross-section. The hollow cylinder is easy to manufacture and can be simply mounted in the through hole.

The closing element is preferably connected to the element in a materially bonded manner in the through-opening. A material-bonded connection, for example a welded, soldered or adhesively bonded connection, is easy to establish, so that the closure element can be fixed in the through-opening reliably and in a manner that is secured against detachment. In this connection, it is preferred that the closing member is glued into the through-hole. This is particularly advantageous in the case of a closure member of plastic.

The closure member is preferably pressed into the through hole. This is particularly advantageous in the case of a closure member of metal material or plastic. This crimp connection can be established very simply. The closure member is preferably connected to at least one member by crimping. In this case, it is particularly preferred that during the pressing-in the closing element expands radially, so that the closing element is firmly fixed in the opening. This may be achieved, for example, by selective compression of the closure member in the axial direction.

The closure member preferably has a flange on one side, by means of which the closure member rests on the member. The corresponding flange makes it easier to fix the closure member in a predefined position, in particular in the axial direction, during mounting.

The pulley decoupler preferably has an intermediate disc that is of a two-piece construction with the closure member extending through an opening in a portion of the intermediate disc. The first intermediate disk element therefore preferably has an opening which is part of the through-opening, while the second intermediate disk part does not have a corresponding opening but forms a stop for the closure element without the ventilation channel having to be closed thereby. This enables a simple construction and a simple mounting of the pulley decoupler.

Preferably, the closure member abuts against an abutment at least on one side in the direction of the axis of rotation for axial fixation. This allows the position of the closure member to be accurately defined in the axial direction, thereby simplifying installation of the pulley decoupler.

Furthermore, a pulley decoupler module is proposed, which comprises a pulley decoupler as described above and a torsional vibration damper which is connected in a rotationally fixed manner to an input part or an output part of the pulley decoupler. The damping efficiency can be further improved by using a torsional vibration damper or a torsional damper. The ventilation channel of the pulley decoupler preferably allows the feed of cooling air to the torsional vibration damper. In the case of insufficient space, this is particularly advantageous when the cooling of the torsional vibration damper has to be assisted solely on the basis of free convection (in particular in that cooling air is drawn in, for example, through a ventilation channel of the pulley decoupler and is guided along the surface of this torsional vibration damper).

The details and advantages disclosed for the pulley decoupler may be transferred to the pulley decoupler module and vice versa.

For the avoidance of doubt, the terms "first", "second" … … are used herein primarily (only) to distinguish between several similar objects, dimensions or processes, i.e., the relevance and/or order of such objects, dimensions or processes to one another must not be predetermined, among other things. Where a dependency and/or order is required, it may be explicitly stated herein or otherwise apparent to one skilled in the art upon study of the specifically described embodiments.

Drawings

The present invention and the technical environment will be described in detail below with reference to the accompanying drawings. It is to be noted that the invention is not limited to the embodiments shown. Unless explicitly stated otherwise, in particular some aspects of the facts illustrated in the drawings may also be extracted and combined with other constituents and knowledge in the present description and/or in the drawings. It is to be expressly noted that the drawings and in particular the dimensional ratios indicated are purely diagrammatic. Like reference numerals refer to like objects, and therefore, the description of the other drawings may be supplementarily taken into consideration as necessary. Wherein:

FIG. 1 is a partial view of a first embodiment of a pulley decoupler module;

FIG. 2 is an embodiment of a closure member;

FIG. 3 is a partial view of a second embodiment of a pulley decoupler module;

FIG. 4 is a partial view of a third embodiment of a pulley decoupler module.

Detailed Description

Fig. 1 shows very schematically a first embodiment of a pulley decoupler module 1 with a pulley decoupler 2 and a torsional vibration damper 3 connected thereto. The pulley decoupler 2 comprises an input part 4 which is connected to a shaft body (for example a drive shaft of an internal combustion engine) via a hub 5. In this case, the input member 4 is connected to the output member 8 by means of a spring device 7. The spring means 7 comprise a plurality of bow springs. The output element 8 has a belt running surface 9 against which, in the mounted state, a traction means, not shown, in particular a belt, bears in order to transmit a torque between the shaft body and the traction means. This traction means has in particular a shape corresponding to the shape of the belt running surface 9. In this case, the shaft body, the hub 5 and the input member 4 rotate about a common rotation axis 10. The output member 8 is supported on the hub 5 by a plain bearing 11. The torsional vibration damper 3 is in particular designed as a viscous torsional vibration damper, in which a shearable viscous liquid is used as damping medium.

The pulley decoupler 2 is here constructed as described above from a plurality of components 12, which in the present embodiment comprise the input part 4, the hub 5, the spring device 7, the plain bearing 11 and the output part 8, as the case may be, further components. When the pulley decoupler 2 is mounted, it is at least partially formed from a component group comprising a plurality of, i.e. at least two, components 12 each. In the present case, a first component group 13 is constructed, which, in addition to the flange 5 and the input part 4, also comprises a diaphragm spring 14 and an intermediate disk 15. At least two components 12 of the first component group 13 (in the present case all components 12 of the first component group) each have an opening 16 which overlaps one another, so that a through-hole 17 is formed through all components of the first component group 13. A blocking element 18 is inserted in the through-opening 17 in a manner that prevents it from being detached, said blocking element being radially limited on the outside by a closed side 19, which on the inside defines a through-opening ventilation channel 20 through which the pulley decoupler 2 can flow for a fluid (for example air). In this case, the side surfaces 19 prevent particles from penetrating between the components of the component group 13 through the openings 16. The closure element 18 is designed here as a hollow cylinder. A further washer 21 is constructed against the movement of the closure element 18 in the direction of the axis of rotation 10, which washer forms a stop for the closure element 18 during installation. The closure member 18 is inserted in a medium-tight manner into the through-opening 17, so that air cannot flow between the closure member 18 and the opening 16. This is achieved in particular by pressing, crimping or gluing the closing member 18 into the through-opening.

During operation, air can flow through the ventilation channel 20 in the direction of the torsional vibration damper 3 in order to cool this torsional vibration damper or to assist in its cooling. The torsional vibration damper 3, the intermediate disk 15, the diaphragm spring 14 (see fig. 3), the input member 4, the hub 5 and the washer 21 are connected by rivets 6.

Fig. 2 shows a detail of an exemplary embodiment of the closing element 18, wherein a circumferential closing bead 23 is formed on the outer diameter 22 of the closing element 18, which bead bears against the edge of the through-opening 17 in the direction of the axis of rotation 10 (axial direction) and seals it in such a way that no fluid flow occurs between the closing element 18 and the through-opening 17.

Fig. 3 shows a second embodiment of the pulley decoupler module 1. With reference to the embodiment for the first embodiment shown in fig. 1, only the differences from this embodiment shall be made clear here. In contrast to the first exemplary embodiment of the pulley coupling 2, the intermediate disk 15 is designed such that it forms an abutment 24 for the closure element 18, so that this closure element is fixed in the axial direction. Fig. 3 also shows an air flow 25 through the ventilation channel 20 and along a surface 26 of the torsional vibration damper 3.

Fig. 4 shows a third embodiment of the pulley decoupler module 1. With reference to the embodiment for the first and second embodiment shown in fig. 1 and 3, only the differences from this embodiment shall be made clear here. Unlike the first and second embodiments, the intermediate disk 15 is formed in two parts from a first intermediate disk member 27 and a second intermediate disk member 28. The first intermediate disk member 27 has an opening 16 which contributes to the realization of the through hole 17, while the second intermediate disk member 28 is constructed in such a way as to form an abutment 24 for the closure member 18. As an option shown in addition, but not limited to, fig. 4, in one embodiment the closure member 18 has a flange 29, by means of which it rests on the member 12 (here the hub 5). This secures the closure member 18 in the axial direction, particularly during installation.

The pulley decoupler 2 has a through-opening 17 which is formed by overlapping openings 16 in the plurality of components 12 and in which a blocking component 18 is accommodated in a manner secured against sliding and has closed sides 19 for preventing particles from penetrating between the components 12 in the region of the openings 16. At the same time, the closure element 18 forms a ventilation channel 20 through which an air flow 25 can pass, for example, in order to cool the torsional vibration damper 3. This is advantageous in particular if, for example, the installation space in a motor vehicle is insufficient and the torsional vibration damper 3 cannot circulate freely, i.e. if this torsional vibration damper is designed, for example, close to the engine, so that the torsional vibration damper 3 is located between the engine, for example, an internal combustion engine, and the pulley decoupler 2.

List of reference numerals

1 Belt pulley decoupler Module

2 Belt pulley decoupler

3 torsional vibration damper

4 input component

5 wheel hub

6 rivet

7 spring device

8 output part

9 working surface of belt

10 rotating shaft

11 sliding bearing

12 component

13-member set

14 diaphragm spring

15 intermediate disc

16 opening

17 through hole

18 closure member

19 side surface

20 ventilating passage

21 shim

22 outside diameter

23 bump

24 abutting part

25 air flow

26 surface of

27 first intermediate disk member

28 second intermediate disk member

29 Flange

Claims

1. A pulley decoupler (2) comprising a plurality of members (12) including at least one hub (5) for connection with a shaft rotatable about an axis of rotation (10), an input component (4) and an output component (8), wherein the hub (5) is connected to the input part (4) or the output part (8) in a torque-transmitting manner, wherein at least two members (12) have at least one opening (16) overlapping each other to form a through hole (17) through the pulley decoupler (2), wherein a closing element (18) is inserted in the through-opening (17) in a manner such that it cannot be pulled off, the closure member is bounded radially outwardly by closed side faces (19) which define internally a through-going ventilation channel (20) through which fluid can flow through the pulley decoupler (2).

2. The pulley decoupler (2) as claimed in claim 1, wherein the closure member (18) is constructed at least partially as a hollow cylinder.

3. Pulley decoupler (2) according to one of the preceding claims, wherein the closing member (18) is connected with the member (12) in the through hole (17) in a material-bonded manner, in particular glued into the through hole (17).

4. The pulley decoupler (2) according to any one of the preceding claims, wherein the closure member (18) is pressed into the through hole (17).

5. The pulley decoupler (2) as claimed in any one of the preceding claims, wherein the closure member (18) is connected to the at least one member (12) by crimping.

6. Pulley decoupler (2) according to any one of the preceding claims, wherein the closing member (18) has a flange (29) on one side, by means of which flange the closing member (18) rests on the member (12).

7. The pulley decoupler (2) according to any one of the preceding claims, wherein the pulley decoupler (2) has an intermediate disc (15) of two-part construction, wherein the closure member (18) extends through an opening in a part (27) of the intermediate disc (15).

8. Pulley decoupler (2) according to any one of the preceding claims, wherein the closing member (18) rests against an abutment (24) at least on one side in the direction of the rotation axis (10) for axial fixing.

9. A pulley decoupler module (1) comprising a pulley decoupler (2) according to any one of the preceding claims and a torsional vibration damper (3) which is connected in a rotationally fixed manner to the input part (4) or the output part (8) of the pulley decoupler (2).